A New Two‐Step Strategy for Encapsulating Amorphous Polymer Chains in Thiourea Crystals,Macromolecular Chemistry and Physics

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A New Two‐Step Strategy for Encapsulating Amorphous Polymer Chains in Thiourea Crystals
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-09-22 , DOI: 10.1002/macp.202000269
Shanshan Li _{1,

2,

3} , Dongxu Lv _{1,

2} , Ning Ai _{2,

4} , Jialong Shen ₃ , Alan E. Tonelli ₃

Affiliation

The establishment of methodologies for encapsulating polymers in small molecular hosts is not only highly desirable to facilitate new material functions but also very important for the development of fundamental science. Herein a new strategy for encapsulating noncrystalline polymer chains with bulky side groups in thiourea (TU) crystals is disclosed. In the process, the noncrystalline polymer is first complexed with TU and 1,4‐dioxane molecules, forming a crystalline metastable complex structure with melting temperature below 110 °C. Subsequent removal of 1,4‐dioxane through heating the complex at 120 °C collapses the metastable complexes, but surprisingly affords a polymer‐TU inclusion compound (IC) structure, as demonstrated by infrared radiation, differential scanning calorimetry, and X‐ray powder diffraction. The strategy is applicable to both atactic‐poly (methyl methacrylate) and ‐polystyrene, suggesting that it might be a universal method for encapsulating noncrystalline polymer chains in thiourea crystal canals.

中文翻译：

在硫脲晶体中包裹非晶聚合物链的新两步策略

建立用于将聚合物封装在小分子主体中的方法不仅是促进新材料功能的理想方法，而且对于基础科学的发展也非常重要。本文公开了一种用于将具有大体积侧基的非晶态聚合物链包封在硫脲（TU）晶体中的新策略。在此过程中，非晶态聚合物首先与TU和1,4-二恶烷分子络合，形成结晶亚稳的络合物结构，熔融温度低于110°C。随后通过在120°C下加热该配合物除去1,4-二恶烷，使亚稳配合物塌陷，但令人惊讶地提供了聚合物-TU包含化合物（IC）的结构，如红外辐射，差示扫描量热法和X射线粉末所示衍射。

更新日期：2020-10-19

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